Develop Bugs

Something's draining my battery faster than it's charging

I have a dock at work that I place my phone onto every day as soon as I arrive. I noticed at about 11 AM today that my phone was showing 72% battery, even though it should have been fully charged when I left this morning at 9 and had been sitting on the charger since 9:30. More annoyingly, it seems to be staying at about that level--it's not moving up at all. If anything, it's continuing to lose charge even as the icon shows it's charging!
I took it to a Sprint store, where they unhelpfully suggested that I have too many apps installed that are draining the battery in the background. I manually stopped most of them, uninstalled some that I don't really use, and put it back on the charger. It's still not going anywhere. I turned the phone completely off for an hour and charged the thing, and it had gained about ten percent (that seems pitiful, but at least it's charging?). It's back on the charger, still not really moving anywhere.
So what are my options at this point? I've never calibrated the battery, so maybe I need to do that. Other than that all I can think is that either the battery is going bad (but I have a feeling Sprint is going to insist "It's still charging" if I take it back to them and refuse to give me another battery), or perhaps the dock is not supplying the right voltage and hence it's not charging fast enough to overtake the power consumption.
What's bugging me is that I haven't installed anything in the past week that should be affecting my power consumption like this. Last week I had plenty of apps installed with GPS and bluetooth always on, and as long as the phone was docked it would eventually reach 100%. Now I have pretty much everything off, several apps I usually have running turned off, and several more uninstalled (including Lookout Security), and the battery is barely making any headway. I keep the screen on to a desk clock (because that's the whole point of a freaking dock), but that alone shouldn't be draining it faster than it can charge.
Any suggestions?

Sounds to me like its not getting enough voltage. When you charge it at home does it charge reasonably fast?
Sent from my SPH-D710 using XDA

I never really monitor it, but I would say so, yeah. All I really check is that it's fully charged in the morning before I walk out the door.
The culprit might be my dock. It says it's designed specifically for the GSII but the cable itself looks to just be your standard USB-to-microUSB dock, other than a little bump at the bottom so that it's clearly aimed for bottom-charger phones like an iphone or SGSII. I suspect it might be supplying less voltage than the charger that came with the phone.
Is there anything I can look at (app or internal setting) that can tell me what kind of voltage the phone is receiving?
EDIT: Should also note that it's sitting on the dock now and it is at least making positive gains on the battery, albeit at maybe 1% every fifteen minutes. I really don't remember it being this slow before. Perhaps the dock's cable is cheap and is just crapping out over time.

USB charging is about half the speed of regular, wall socket charging. Invest in an OEM charger or one that has similar specs to an OEM one.
Sent from my Galaxy S II, AOKP style.

do you have the dock connected to a USB port on a computer/laptop or wall outlet?
USB charges at 150mah while most ac adapters charge at between 750-1000mah.

Well, when I used the my generic LG USB cable it took about 5 hours to reach from 0% to about 40% while shut. So, I changed the cable and viola, charging to full in less than 3 hours while working on it.
So, it seems that the charger is bad quality. Try using the original cable (if possible) or may be the original charger plug.
I guess that's the only solution, because there is no way that the phone is discharging at a faster rate than charging, except when it is connected to an external display. This is the only thing that I encounter where the phone goes dead after a while despite it is connected to the charger...

Yeah, that dock is a POS. I'm not surprised it charges slow as balls too.
Amusingly, my phone has been running on the battery since leaving work for about four hours with the screen off, and it's only at 92%! I must have uninstalled whatever was draining it so quickly.
Thanks, guys.

If you think it's an application draining it, try better battery stats in the market. Might not be the problem but it does help.
Sent from my iPhone killer.

ahmadshawki said:
Well, when I used the my generic LG USB cable it took about 5 hours to reach from 0% to about 40% while shut. So, I changed the cable and viola, charging to full in less than 3 hours while working on it.
So, it seems that the charger is bad quality. Try using the original cable (if possible) or may be the original charger plug.
I guess that's the only solution, because there is no way that the phone is discharging at a faster rate than charging, except when it is connected to an external display. This is the only thing that I encounter where the phone goes dead after a while despite it is connected to the charger...
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Click to collapse
That's right. Use Original cable came with your phone.
I've experienced same thing when I tried to charge my D710 over LG micro usb charger thru AC outlet. The charging indicator was showing flash but actually it was not charging or charging speed was not enough to follow the battery usage.
I charged the phone all the night but in the morning it was empty!
Charging through the original Samsung micro usb cable, it never failed. But charging thru LG micro usb failed couple of times.
You can easily check a couple of things -
try to connect micro usb cable to your PC and set the USB mass storage mode.
If we use LG micro usb over samsung phone, it's not perfectly fit and data communication frequently fails. More importantly, Don't even try to odin your phone using LG micro usb.
It's not the issue of charger. It's the cable issue.
Do not use LG Micro USB cable for data communication, but if you want to use for charging, be sure that you hear the connection sound from the phone. If there's no connection sound, the battery won't last long even battery charging status shows the flash.
Hope this help.

Anyone else having problems with extremely slow charging?

When I first got this phone I noticed it charged pretty slow. 5 hours to get to full from 0% but it then got a lot worse. Over night it would only charge from like 18% to 41 so I got a new charger and wall adapter and that seemed to fix it for a couple days but now it is charging slow again. From 70% to 100 it takes about 6-7 hours. Anyone else experiencing this?

The only time I've heard of that happening is when people fail to 'condition' their lithium battery properly before normal use.
In other words, upon getting your new phone, and/or battery, you're suppose to allow your battery to fully discharge and then fully recharge 3-5 times to condition your battery before plugging it back in half way through discharge.
It's usually what the carrier sales clerks are suppose to tell you when purchasing a new smartphone.
Here's a simple article on the subject:
http://www.ehow.com/how_4797458_condition-cell-phone-battery.html
Sent from my SPH-L710 using xda app-developers app

drewmonge said:
The only time I've heard of that happening is when people fail to 'condition' their lithium battery properly before normal use.
In other words, upon getting your new phone, and/or battery, you're suppose to allow your battery to fully discharge and then fully recharge 3-5 times to condition your battery before plugging it back in half way through discharge.
It's usually what the carrier sales clerks are suppose to tell you when purchasing a new smartphone.
Here's a simple article on the subject:
http://www.ehow.com/how_4797458_condition-cell-phone-battery.html
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
I never had/has/have doing it. And I dont have battery issues.
I think the battery calibration/cycle..etc is just a myth.
Go to the store and check for warranty.
Sent from my SPH-L710 using Tapatalk 2

Could it be a rouge app causing it to take so long to charge? I noticed today Google maps was using a lot more of the battery than usual. Almost as much as the screen. I tried force stopping but it just starts right back up again. Any ideas on how to fix the maps app? I have a feeling that is what is causing it.

I have this problem. It is very annoying and I have no idea what causes it. It doesn't happen all of the time though.

rbtrucking said:
Could it be a rouge app causing it to take so long to charge? I noticed today Google maps was using a lot more of the battery than usual. Almost as much as the screen. I tried force stopping but it just starts right back up again. Any ideas on how to fix the maps app? I have a feeling that is what is causing it.
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Click to collapse
Just sounds like a bad install of something. I would do a factory reset through the stock recovery, and make sure to wipe dalvik cache.

My phone has started charging slowed as well, but mostly when connected to the computer. I made sure my usb ports were set to not allow the computer to shut them off to conserve power and it seems a bit faster. As far as charging and discharging ect ect I don't do that and never had a problem with slow charging and even the couple of times I tried it, the battery life never really improved. So think it is needed and some think it is a waste of time.

Charging via a computer USB port will always be slow when compared to the higher current capacity of the included AC charger. Computer USB ports have a lower current rating.
Make sure your using the charger that came with the phone, not all chargers are created equally.
There's also been some talk about the quality of USB cable being used, but I haven't found that myself yet.

Little bit of info...
I have tried numerous chargers while at work here (Technician) and there are some issues.
Samsung is funny on which chargers it accepts. Very funny.
1. Stardard charger that comes with the device will charge best. (Obvious I know) Using wall charger. (Full charge in 3.5 to 4 hours from 1%)
a. Using USB end plugged into PC while charging takes typically from my tests double the time to charge. (I'm guessing that data connection to PC is slowing the charge. (Full charge in 6 hours from 1%)
2. 3rd Party Generic charge cables (usb cable only) still charges device however stardard power draw is lower and does not charge in a decent time period.
a. Some 3rd Party usb cables plugged into a pc showed charging however they did not keep enough of a draw to actually charge my phone. I lost battery instead of gaining.
3. LG chargers did nothing for me. Couldn't get a decent charge.
Motorola chargers gave me the best charge besides the original.
Chargers with replacement tips... what can I say. They didn't seem like a good idea and weren't. I had too many issues and at times had some overheating issues. Luck of the draw me thinks.
3rd party wall chargers were hit or miss. A few did seem to give me a decent charge, others gave me a very slow trickle charge taking anywhere up to 8-9 hours for a full charge from 1%
All in all... it's a crap shoot using 3rd party cables. It's all based on voltage output and Samsung likes to change things alot. You will still get a charge but who knows the length of time it will take.
Oh and car chargers... typically only good for keeping it at the same level you plugged it in at for short drives. Long drives obviously work much better.
Hope this helps.

About charging: I have noticed that micro USB cable that come with S3 is really bad - it is loosing a connection to PC,and, beside that, I have noticed several times slow phone charge... Accidentally went to settings- battery - when I was on AC charger and saw in settings that phone is actually charging in USB mode!!! Wtf??? Disconnect usb from bottom end (at charger side) and reconnect and then on phone says " charging - AC" ... So,conclusion is that you check your phone charging status when you put on charger,maybe it is charging in USB mode and because of that phone is charging slower than it should on regular AC power.

The only battery issue that i have noticed is when i use my computer to charge it takes forever but when i use the factory wall plug and cable it charges quickly with no issues

Excellent post supercholo. Really helpful. I was starting to think my phone was broken.
Anyone got any experience with using an ipad charger on an sIII. I know an ipad wants a lot of power to charge.
FYI These are the voltages listed on my chargers;
Apple ipad1 charger 5.1v 2.1a
SAMSUNG s3 wall charger 5v 1a
Samsung Galaxy i9000 wall charge 5v .7a
supercholo said:
Little bit of info...
I have tried numerous chargers while at work here (Technician) and there are some issues.
Samsung is funny on which chargers it accepts. Very funny.
1. Stardard charger that comes with the device will charge best. (Obvious I know) Using wall charger. (Full charge in 3.5 to 4 hours from 1%)
a. Using USB end plugged into PC while charging takes typically from my tests double the time to charge. (I'm guessing that data connection to PC is slowing the charge. (Full charge in 6 hours from 1%)
2. 3rd Party Generic charge cables (usb cable only) still charges device however stardard power draw is lower and does not charge in a decent time period.
a. Some 3rd Party usb cables plugged into a pc showed charging however they did not keep enough of a draw to actually charge my phone. I lost battery instead of gaining.
3. LG chargers did nothing for me. Couldn't get a decent charge.
Motorola chargers gave me the best charge besides the original.
Chargers with replacement tips... what can I say. They didn't seem like a good idea and weren't. I had too many issues and at times had some overheating issues. Luck of the draw me thinks.
3rd party wall chargers were hit or miss. A few did seem to give me a decent charge, others gave me a very slow trickle charge taking anywhere up to 8-9 hours for a full charge from 1%
All in all... it's a crap shoot using 3rd party cables. It's all based on voltage output and Samsung likes to change things alot. You will still get a charge but who knows the length of time it will take.
Oh and car chargers... typically only good for keeping it at the same level you plugged it in at for short drives. Long drives obviously work much better.
Hope this helps.
Click to expand...
Click to collapse

Very slow charging with OEM charger.. i9300
This is a fact. The OEM wall charger surely has some issues. Though 1amp output, as claimed on th specs chart, my i9300 charges super slow. From 80% to 100%, it takes nearly 3 hours.
So, i switched chargers and used my S2 and Note OEM wall chargers. And voila, the phone charges super fast. I even ordered a new OEM charger for s3 with the data cable included and the same issue occured.
This has worsened ever since the JB update. So I am now using the S2 charger and very satisfied.
SWTICH OVER GUYS!! OEM charger is useless,,,

I have had my phone on USB to computer charging for 7 hours, with a one hour break to watch Dexter. I was at 18% and I am now at 69%. I think I will have to use the wall adapter because this is just ridiculous.

Usb to pc will always be slow buddy. It outputs 500ma while d wall charger is 1 amp
I found my Usb cable faulty. Sent for replacement.
Cheers
→→Android▶◀▶◀ ROCKS!◆◆◆

Without reading all the post. I have had this same problem. Took phone to sprint, they tested the battery and it was bad. Got a new one and good to go..

[Q] Charging issues - CM10.1

I currently have the CM10.1-M3 build from 4/17/13 installed.
For a long while, I have been having major issues charging my Captivate Glide.
My original battery died. It was bloated. I called AT+T and they sent me a replacement. I also bought two high capacity batteries.
If I leave the phone charging about half the time little or no progress is made charging. Lat night I charged the phone for over 8 hours and the charge went from 10% to 14%.
Other times I will wake up after charging it all night and it will say fully charged, but then the instant it is unplugged from the charger, it will drop down from 100% to 20% or less.
Then once every 3 or 4 days it will actually fully charge. But even in that case the charging is slow at best.
I did a full wipe and re-flashed last night and nothing changed. I have tried charging in airplane mode, but that seems to make it worse. I have had a little tiny bit of success turning mobile data off, but otherwise I have tried everything I could think of with no luck.
Has anyone else experienced similar issues, or have any suggestions? Is this a case where I might need to replace the phone entirely?

jacobym1 said:
I currently have the CM10.1-M3 build from 4/17/13 installed.
Has anyone else experienced similar issues, or have any suggestions? Is this a case where I might need to replace the phone entirely?
Click to expand...
Click to collapse
I did notice a lot longer charge time when hooked up to USB on computer, on my car charger and hooked up to AC I seem to get a lot quicker charge...
What charger are you using?

yohan4ws said:
I did notice a lot longer charge time when hooked up to USB on computer, on my car charger and hooked up to AC I seem to get a lot quicker charge...
What charger are you using?
Click to expand...
Click to collapse
I have tried a few different chargers. I mostly use a 2.1amp wall charger. I also have a 1 amp wall charger, and a 1 amp car charger. I have tried about 3 different car chargers.
I am really suspicious that the micro-usb port on the phone went bad and that I will need to get the phone replaced.

Charging with AC is gonna be alot faster then with DC. But as far as it being the rom I don't see tthat.. sounds like possibly a loose wire or bad connection when u lay ur phone down
Sent from my SGH-I927 using xda app-developers app

phatryan has a point, do a nandroid backup, flash to stock and see if the charging makes a difference..

Charging
Hello,
When I charge my Captivate Glide with phone powered up plugged in to the wall, using the supplied wall charger, I've noticed that the battery seems to drain quicker. This is with the original battery, I will be getting an extended battery for my phone. If I power the phone down then charge it in to the wall it charges quickly and seems to take longer draining. This does not happen when charging with the PC.
tech927

jacobym1 said:
I currently have the CM10.1-M3 build from 4/17/13 installed.
For a long while, I have been having major issues charging my Captivate Glide.
My original battery died. It was bloated. I called AT+T and they sent me a replacement. I also bought two high capacity batteries.
If I leave the phone charging about half the time little or no progress is made charging. Lat night I charged the phone for over 8 hours and the charge went from 10% to 14%.
Other times I will wake up after charging it all night and it will say fully charged, but then the instant it is unplugged from the charger, it will drop down from 100% to 20% or less.
Then once every 3 or 4 days it will actually fully charge. But even in that case the charging is slow at best.
I did a full wipe and re-flashed last night and nothing changed. I have tried charging in airplane mode, but that seems to make it worse. I have had a little tiny bit of success turning mobile data off, but otherwise I have tried everything I could think of with no luck.
Has anyone else experienced similar issues, or have any suggestions? Is this a case where I might need to replace the phone entirely?
Click to expand...
Click to collapse
Bloated battery could just be bad - but it could also be due to overcharging. That's not going to happen unless there is a serious problem with your phone, or possibly a problem with the contacts leading to an incorrect voltage reading. This also may explain your problems charging and sudden jumps in charge %.
Clean your contacts well on the battery side and phone side with a pencil eraser, rubbing alcohol, etc.
I notice a big difference with whatever kernel is shipping with the current M3 cm10.1 build between a 500ma charger and 2amp charger, so I imagine the kernel is set for a 750ma or 1amp charge.

New Charger Won't Charge S III?

Hey everybody. I have a Galaxy S III from Virgin Mobile and it's been great... so far. Question is... my phone, battery, and charger have been going a little crazy. Lately, the battery has been charging slow, wouldn't say extremely slow but when I first got the phone, it charge pretty quickly. Now, it takes (I'm guessing here) about three hours just to charge to about 40-50% on a dead battery versus when I first got it, it would charge to near 80% to full battery in that same amount of time (again, just guessing but trying to paint a picture of what I mean). In addition, when I go to plug the USB in like normal, sometimes the phone would make the charging beeping noises continuously until I unplug the charger. When I leave it overnight, for the most part now, it won't even charge to 100%. When it did charge to 100%, it quickly drained to 75% in only one minute! I'm hoping it's not the port because nothing really happened to it (no drops, etc). I thought it was the port so in order to test it out, I used my brother's micro-USB cable and charger and it worked without the continuous beeping but still charged slow, which led me to believing it might be a software thing and the Android OS for some reason crapping out and "misreading" the actual battery level.
In a semi-related thing, I thought it might be the charger dying so I went out to Target to buy a Belkin Home Charger and ChargeSync Cable. This cable supposedly supplies 2.1 amps of power to the device, however, it won't even charge my phone even though Belkin says it works with Galaxy S3s right on the box. Never had problem using other micro-USB cables until now. The Belkin charger is the 2nd one I've used and it hasn't charged. Maybe too much amperage is going into the device? The other charger was a Rocketfish charger with the same specs. I figured it might be the USB cable itself because I paired the OEM cable with the Belkin charger and it worked. But I find it strange that identical micro-USB cable can and cannot charge the S III because I've switched cables in the past and it worked.
Sorry for the tons of info. Just trying to be as informative as possible. :angel:

Battery could be the problem
Charge the phone as high as it will go, then let it discharge all the way until it powers off, then leave it off while charging it all the way it will go (hopefully 100%).
If you are rooted, download "Battery Calibration" and "Rebooter". Run the first, then the second (a normal reboot often undoes the first - it deletes a file that often has stale data, but it gets written back on a normal reboot).
You can order a new battery from Amazon. It cost me about $8. Good to have a spare and you'll know if your battery was the problem if the above doesn't fix it.

[Q] Tab Pro 8.4 (stock, unrooted) not charging properly. Worked fine for months.

Did anybody get issues months after they'd purchased the device?
My 8.4 Pro worked perfectly (6-8h SoT, 100% charge everytime) for about 2 months, but hasn't been charging properly since yesterday. I tried combos of all my charger/cables - they are all giving 1A+ rate on my other devices, but not even being measured on the tab (vis Ampere). Battery has been stuck around 50% for ages. I'm in India, so no easy way to get this back to the US for warranty replacement. Besides, by the time I return to NJ, the tab will be out of warranty.
Please note that I have also factory reset it. The problem, unfortunately, persists.
What should I do? This may not be a software issue: I use this tab while I'm on a stationary cycle, so maybe that motion somehow 'knocked' the battery out of whack somehow? Should I open up the tab and do a battery reset? Is there any, less dangerous, solution?

SoberDogs said:
Did anybody get issues months after they'd purchased the device?
My 8.4 Pro worked perfectly (6-8h SoT, 100% charge everytime) for about 2 months, but hasn't been charging properly since yesterday. I tried combos of all my charger/cables - they are all giving 1A+ rate on my other devices, but not even being measured on the tab (vis Ampere). Battery has been stuck around 50% for ages. I'm in India, so no easy way to get this back to the US for warranty replacement. Besides, by the time I return to NJ, the tab will be out of warranty.
Please note that I have also factory reset it. The problem, unfortunately, persists.
What should I do? This may not be a software issue: I use this tab while I'm on a stationary cycle, so maybe that motion somehow 'knocked' the battery out of whack somehow? Should I open up the tab and do a battery reset? Is there any, less dangerous, solution?
Click to expand...
Click to collapse
You need to use a 2A rated charger and really there is only a few that qualify, I suggest you only use the Samsung charger as they seem to have a certain way to charge it, chargers do go bad sometimes so look for an official replacement (they cost like $5 on ebay), beware of knockoffs though since they look identical, I suggest searching for the same model number on the charger. IE : EP-TA10JWE
anyways here are some things to try in the meantime
1. drain the battery down to 15%
2. hold the power button down and choose the Power Off setting, wait until you feel it vibrate, now let the tablet sit for an hour in this state. (do not hook it to a charger)
3. after an hour or two, plug the charging cable into the table and let it charge (do not turn it on), you should see an animated battery screen show up a few times, see if it reaches 100% in this "powered off" state.
if it does then that could mean there is an app running in the BG when it is started causing a lot of cpu load or keeping it awake..
I've so far had my tab 8.4 for almost a year and the battery is still holding up with 8-10h of runtime (depending on what I do). and it always charges to 100% using the samsung charger.

otyg said:
You need to use a 2A rated charger and really there is only a few that qualify, I suggest you only use the Samsung charger as they seem to have a certain way to charge it, chargers do go bad sometimes so look for an official replacement (they cost like $5 on ebay), beware of knockoffs though since they look identical, I suggest searching for the same model number on the charger. IE : EP-TA10JWE
Click to expand...
Click to collapse
The chargers I tested were rated 2A, and their cables were 28/24 AWG. On my Dell Tablet, the same setup was giving me around 1300 mah. On the pro, most of the time the current didn't even get measured.
Tried the other things you mentioned. It charges, overnight, to 100%, but despite the factory reset, weird battery behaviour is observed: slow recharge, jumping from 93% to 100% the moment i connected it to the lappy to transfer data, etc.

SoberDogs said:
The chargers I tested were rated 2A, and their cables were 28/24 AWG. On my Dell Tablet, the same setup was giving me around 1300 mah. On the pro, most of the time the current didn't even get measured.
Tried the other things you mentioned. It charges, overnight, to 100%, but despite the factory reset, weird battery behaviour is observed: slow recharge, jumping from 93% to 100% the moment i connected it to the lappy to transfer data, etc.
Click to expand...
Click to collapse
You are using the Samsung charger?, I noticed with other chargers for some reason when the battery gets near full the mA drops to under 200mA and stops charging the battery or its just enough to keep the tablet running, this does not happen with the Samsung charger it mostly charges the tablet at 1880~mA, when its in the 90% range drops to about 600-800mA so it can still trickle charge the batt and provide enough power to keep it running.
I have tried other chargers like the 2A HP Touchpad Charger (was supposed to be the best charger out) and some 2A powerbanks - and they all fall short near 90%, just don't pull enough amps, I think the samsung charger has a higher voltage too 5.60v where the others are around 5.30v
btw I have an actual hardware mA cable that shows the current in realtime, I'm not sure how accurate the battery monitor programs are for android without root access, since without root I don't know how they read the system files.

otyg said:
You are using the Samsung charger?, I noticed with other chargers for some reason when the battery gets near full the mA drops to under 200mA and stops charging the battery or its just enough to keep the tablet running, this does not happen with the Samsung charger it mostly charges the tablet at 1880~mA, when its in the 90% range drops to about 600-800mA so it can still trickle charge the batt and provide enough power to keep it running.
I have tried other chargers like the 2A HP Touchpad Charger (was supposed to be the best charger out) and some 2A powerbanks - and they all fall short near 90%, just don't pull enough amps, I think the samsung charger has a higher voltage too 5.60v where the others are around 5.30v
btw I have an actual hardware mA cable that shows the current in realtime, I'm not sure how accurate the battery monitor programs are for android without root access, since without root I don't know how they read the system files.
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Click to collapse
Getting a slow current with the 5.3v samsung charger and cable as well. But yeah, using software (GSM battery, Ampere) to get the charge.

SoberDogs said:
Getting a slow current with the 5.3v samsung charger and cable as well. But yeah, using software (GSM battery, Ampere) to get the charge.
Click to expand...
Click to collapse
Hm I suppose the battery could of went bad if it wasn't being charged properly by some chargers for example if it was never reaching 100% then the system never shuts off the charging mechanism and will essentially cook the battery causing it to die faster then normal .
If you had root access you could check the status of the battery and it would report the battery info in stages - very good (brand new), good, bad, fail ..etc I am not sure if non root programs can access this info.
I guess there are a few extra things to try.
1. A new Samsung charger, it might be possible yours went bad.
2. re-seat the battery, though this requires opening the tablet possibly voiding the warranty or causing other damage - maybe take it to a repair shop if you have difficulties, from what I have read on this forum it has solved numerous cases like yours, not sure exactly what it does perhaps removing voltage from the hardware causes and glitches to reset like from accidental static electricity shocks or if it just re-calibrates the battery like it was replaced..etc, it might just be the connector comes loose, anyways it sucks Samsung didn't included a reset button since it's a needed feature for sealed tablets)

SoberDogs said:
Tried the other things you mentioned. It charges, overnight, to 100%, but despite the factory reset, weird battery behaviour is observed: slow recharge, jumping from 93% to 100% the moment i connected it to the lappy to transfer data, etc.
Click to expand...
Click to collapse
This is a fairly common issue on this device. Its a defect, I'm thinking its the "smart battery" circuitry on the battery itself (my understanding, at least some of the metering is done on the battery by this circuitry). Its been discussed at length on the following thread; with the suggested fix being to open up the tablet and "reseat" the battery: http://forum.xda-developers.com/galaxy-tab-pro-12-10-8/general/reseating-battery-wonder-battery-life-t2944610
I've had this problem for a while now. The issue was non-existent or rare at first, then got more common after owning the device for a few months. Haven't used any apps to measure the mA, but this is across 3 or 4 different chargers, 2 of which are original Samsung 2A chargers (had another one left from my broken Note 8). The issue also persists whether on stock ROM, custom TouchWiz ROM, or custom AOSP ROMs.
Sometimes the tablet will charge fully, no issue. Sometimes it will stop somewhere along the way (well short of 100%) and doing a reboot will usually get the charging "going" again. Sometimes I will need to reboot 3 or 4 times to get it charged to 100%. I've also tried factory resets, but its hard to say whether this helps or not.
Short of rebooting while charging, there isn't much I've found to help. I haven't tried opening the device to reseat the battery.

Maybe the usb port in the tablet has some debri in it. Try blowing it out with some cpompressed air. The symtoms sound like a faulty usb cable but if you have tried different ones it might be the port.
Sent from my SM-T320